JP6137402B2 - Magnetic tape and shielded cable - Google Patents

Description

  The present invention relates to a magnetic tape and a shielded cable.

  Conventionally, a high-frequency attenuation cable that prevents EMI (Electro Magnetic Interference) has been proposed (see, for example, Patent Document 1).

  This high-frequency attenuation cable is formed by winding a magnetic tape made of a magnetic material around a conductor wire in a spiral shape so as to partially overlap. Thereby, electromagnetic wave noise emitted from the conductor wire is attenuated by the magnetic tape, and flexibility can be ensured. The magnetic tape is generally formed by slitting, that is, by continuously cutting a long sheet having a large width at a constant width and winding it on a roll or a reel.

Japanese Patent Laid-Open No. 62-190609

  However, according to the conventional high-frequency attenuation cable, burrs are generated on both end surfaces in the width direction when slitting the magnetic tape, so when the magnetic tape is wound spirally, the tip of the burrs comes into contact with the surface of the tape. The tape may be lifted and the effective permeability may be reduced.

  Accordingly, it is an object of the present invention to provide a magnetic tape and a shielded cable that are less likely to lift the tape when wound on a conductor wire, and thereby can prevent a decrease in effective magnetic permeability.

  In order to solve the above-mentioned problems, the present invention is a magnetic tape formed by continuously cutting a long sheet made of a magnetic material with a certain width, Provided is a magnetic tape having at least a rear surface along a longitudinal direction with a groove accommodating at least one burr of a pair of burrs formed on both end surfaces in the width direction at the time of cutting.

  In addition, the present invention is a magnetic tape formed by continuously cutting a long sheet made of a magnetic material having a resin layer formed on the back surface thereof with a certain width in order to solve the above problems. There is provided a magnetic tape having a groove along at least the back surface along the longitudinal direction for accommodating at least one burr of a pair of burrs formed on both end surfaces in the width direction when the long sheet is cut.

  The magnetic material may be an amorphous alloy. The magnetic material contains Fe, Si, B, and Cu, and further contains an amorphous alloy containing at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W. It may be a nanocrystalline soft magnetic alloy that has been subjected to nanocrystallization heat treatment.

  In order to solve the above problems, the present invention comprises an insulated wire in which the periphery of a conductor wire is covered with an insulator, and a magnetic tape layer formed by winding a magnetic tape around the insulated wire, The magnetic tape is a magnetic tape formed by continuously cutting a long sheet made of a magnetic material at a constant width, and is formed on both end surfaces in the width direction when the long sheet is cut. Provided is a shielded cable having a groove accommodating at least one burr of a pair of formed burrs along a longitudinal direction on at least a surface facing the insulated wire side.

  In addition, the present invention aims to solve the above-described problems, and includes an insulated wire having a conductor wire covered with an insulator and a magnetic tape layer formed by winding a magnetic tape around the insulated wire. The magnetic tape is a magnetic tape formed by continuously cutting a long sheet made of a magnetic material having a resin layer formed on the surface on the insulated wire side with a constant width, Provided is a shielded cable having a groove that accommodates at least one burr of a pair of burrs formed on both end surfaces in the width direction when a long sheet is cut, at least on a surface facing the insulated wire side along the longitudinal direction. To do.

  The magnetic material constituting the magnetic tape may be an amorphous alloy. The magnetic material constituting the magnetic tape contains Fe, Si, B, and Cu, and further contains at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W. A nanocrystalline soft magnetic alloy obtained by subjecting the amorphous alloy to be subjected to a heat treatment for nanocrystallization may be used.

  According to the present invention, it is difficult for the tape to be lifted when it is wound around a conductor wire, thereby suppressing a decrease in effective magnetic permeability.

FIG. 1 is a perspective view showing a schematic configuration of a shielded cable according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the shielded cable shown in FIG. FIG. 3 is a partial cross-sectional view showing a state in which the magnetic tape according to the first embodiment is wound around the resin tape layer. 4 is a cross-sectional view of the magnetic tape shown in FIG. FIG. 5A is a cross-sectional view showing an example of the manufacturing process of the magnetic tape according to the first embodiment. FIG. 5B is a cross-sectional view showing an example of the manufacturing process of the magnetic tape according to the first embodiment. FIG. 5C is a cross-sectional view showing an example of the manufacturing process of the magnetic tape according to the first embodiment. FIG. 6 is a partial cross-sectional view showing a state in which the magnetic tape according to the second embodiment of the present invention is wound around the resin tape layer. FIG. 7 is a cross-sectional view of the magnetic tape shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, about the component which has the substantially same function, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

[First Embodiment]
FIG. 1 is a perspective view showing a schematic configuration of a shielded cable according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the shielded cable shown in FIG. In addition, illustration of the inclusion 5 is abbreviate | omitted in FIG.

  This shielded cable 1 is formed by a plurality (three in this embodiment) of insulated wires 4 in which the conductor wire 2 is covered with an insulator 3 and an inclusion 5 interposed around the plurality of insulated wires 4. A resin tape layer 6, a magnetic tape layer 7 provided around the resin tape layer 6, and a sheath 8 as an insulating protective layer made of resin or the like provided around the magnetic tape layer 7.

  The conductor wire 2 is formed by twisting a plurality (seven in this embodiment) of fine metal wires 2a. The insulated wire 4 transmits electric power with a signal of 100 MHz to 10 GHz or a carrier frequency of 10 MHz or less, for example. The conductor wire 2 may be a single wire. Moreover, although the insulated wire 4 was made into multiple in this Embodiment, one may be sufficient. The insulated wire 4 may be a twisted pair wire that transmits a differential signal.

  The resin tape layer 6 is formed by winding the resin tape around the plurality of insulated wires 4 with the inclusions 5 interposed in the cable longitudinal direction. As the resin tape, for example, a tape made of a resin such as polyethylene terephthalate (PET) or polypropylene resin can be used.

  The magnetic tape layer 7 is formed, for example, by winding a magnetic tape 70 made of a magnetic material around the resin tape layer 6 in a spiral shape in the cable longitudinal direction.

  The sheath 8 is made of, for example, a vinyl chloride resin, an ethylene-vinyl acetate polymer, a fluorine resin, a silicone resin, or the like.

(Configuration of magnetic tape layer)
FIG. 3 is a partial cross-sectional view showing a state in which the magnetic tape 70 is wound around the resin tape layer 6. 4 is a cross-sectional view of the magnetic tape 70 shown in FIG.

  The magnetic tape 70 is formed by slitting (cutting) a long sheet made of a magnetic material continuously with a certain width. The magnetic tape 70 has a groove 74 that accommodates one burr 75b of a pair of burrs 75a and 75b formed on both end faces 73a and 73b in the width direction when a long sheet is cut. The back surface 72 is provided along the longitudinal direction. The groove 74 is located closer to one end surface 73a side than the center in the width direction of the magnetic tape 70, that is, when the magnetic tape 70 is spirally wound around the resin tape layer 6, the other burr 75b is formed in the groove. 74 is formed at a position where it enters. When the magnetic tape 70 is wound around the resin tape layer 6, one back surface 72a of the back surface 72 separated by the groove 74 is in contact with the front surface 71 of the magnetic tape 70, and the other back surface 72b is Contact the resin tape layer 6. Since the magnetic tapes 70 wound in a spiral form are in surface contact with each other, electromagnetic noise is difficult to leak, and a decrease in effective magnetic permeability can be suppressed.

  The magnetic material of the magnetic tape 70 is preferably made of a soft magnetic material having a small coercive force and a large magnetic permeability in order to suppress electromagnetic noise. Examples of soft magnetic materials include amorphous alloys such as Co-based amorphous alloys and Fe-based amorphous alloys, ferrites such as Mn-Zn ferrite, Ni-Zn ferrite, Ni-Zn-Cu ferrite, and Fe-Ni alloys. It contains soft magnetic metals such as alloys (permalloy), Fe-Si-Al alloys (Sendust), Fe-Si alloys (silicon steel), or Fe, Si, B, Cu, and further Ti, V, Zr, Nanocrystalline soft magnetic alloy powder obtained by performing nanocrystallization heat treatment on an amorphous alloy containing at least one element selected from Nb, Mo, Hf, Ta, and W can be used. Among these soft magnetic materials, the nanocrystalline soft magnetic alloy powder is preferable because the relative permeability is as large as that of the Co-based amorphous alloy and the change in relative permeability with time is small.

  For example, a magnetic tape having a thickness of 25 μm, 50 μm or 75 μm and a width of 10 to 20 mm can be used. The depth d of the groove 74 is to accommodate the height h (for example, about 10 μm) h of the burrs 75a and 75b, so that the average height of the burrs 75a and 75b (for example, 10 locations on one side for a length of 1 m, a total of 20 locations on the micrometer). ½ times to 5 times the average value of the values measured in (1), preferably 4/5 times to 2 times. The width of the groove 74 is preferably, for example, 1 mm or more and 3 mm or less in consideration of winding accuracy and displacement of the magnetic tape 70 in the cable length direction when the cable is bent.

(Magnetic tape manufacturing process)
5A to 5C are cross-sectional views illustrating an example of the manufacturing process of the magnetic tape 70 according to the first embodiment. Hereinafter, an example of a manufacturing process of the magnetic tape 70 formed from an amorphous alloy will be described.

  First, as shown in FIG. 5A, a wide magnetic sheet 700 formed into an amorphous alloy is passed through the groove processing apparatus 10 to form grooves 74 by rolling. The groove processing device 10 is provided at a position facing the pressing roller 11 that presses the magnetic sheet 700 and the pressing roller 11, and the processing roller 12 that forms the groove 74, and the pressing roller 11 and the processing roller 12 can be rotated integrally. A shaft 13 to be connected and a motor (not shown) that rotates the shaft 13 are provided. The grooves 74 are alternately formed on the front surface 700a and the back surface 700b of the magnetic sheet 700 along the width direction. In addition, the groove processing apparatus may perform a cutting process to form the groove 74.

  Next, as shown in FIG. 5B, the amorphous magnetic sheet 700 is passed through the slit processing apparatus 20 to form a magnetic tape 70 having a narrower width than the magnetic sheet 700. The slit processing apparatus 20 is formed by integrating the upper cutters 21a and 21b disposed on the front surface 700a side of the magnetic sheet 700, the lower cutters 22a and 22b disposed on the rear surface 700b side of the magnetic sheet 700, and the upper cutters 21a and 21b. A shaft 23 that is rotatably connected, a shaft 24 that rotatably connects the lower cutters 22a and 22b, and a motor that rotates the shaft 23 and the shaft 24 in synchronization are provided. The clearances between the upper cutter 21a and the lower cutter 22a and between the upper cutter 21b and the lower cutter 22b are adjusted so that the burrs 75a and 75b are as small as possible. Further, the upper cutters 21a and 21b are inward or outward with respect to the lower cutters 22a and 22b so that the burrs 75a and 75b formed on the both end faces 73a and 73b in the width direction face the same direction. It arrange | positions so that it may be located in.

  As shown in FIG. 5C, burrs 75a and 75b are formed on both end faces 73a and 73b of the magnetic tape 70 slit by the slit processing apparatus 20. Thereafter, each magnetic tape 70 is wound on a roll or a reel.

(Operation and effect of the first embodiment)
According to the first embodiment, the following operations and effects are achieved.
(1) When the magnetic tape 70 is spirally wound around the resin tape layer 6, the other burr 75 b enters the groove 74, and the magnetic tapes 70 are in surface contact with each other, so that the magnetic tape 70 hardly rises. Thus, it is possible to suppress a decrease in effective magnetic permeability.
(2) The magnetic tape layer 7 absorbs the magnetic field of electromagnetic noise generated from the insulated wire 4 and suppresses radiation of electromagnetic noise.
(3) Since the magnetic tape layer 7 is formed by winding the magnetic tape 70 in a spiral shape, it is possible to provide a shielded cable with excellent bending characteristics.

[Second Embodiment]
FIG. 6 is a partial cross-sectional view showing a state in which the magnetic tape according to the second embodiment of the present invention is wound around the resin tape layer. FIG. 7 is a cross-sectional view of the magnetic tape shown in FIG.

  In the first embodiment, the magnetic tape layer 7 is configured using the magnetic tape 70 on which the resin layer is not formed on the back surface 72. However, in the present embodiment, the resin layer 91 is formed on the back surface 72 of the magnetic tape 70. The magnetic tape layer 9 with a resin layer is configured using the magnetic tape 90 with a resin layer formed. In addition, the magnetic tape 90 with a resin layer is an example of a magnetic tape, and the magnetic tape layer 9 with a resin layer is an example of a magnetic tape layer.

  The magnetic tape layer 9 with a resin layer according to the present embodiment includes, for example, a magnetic tape 90 with a resin layer spirally arranged in the longitudinal direction of the cable so that the resin layer 91 faces the resin tape layer 6 side around the resin tape layer 6. Formed by wrapping across.

  For the resin layer 91, for example, a resin such as polyethylene terephthalate (PET) or polypropylene resin can be used.

  The magnetic tape 90 with a resin layer is formed, for example, by continuously slitting (cutting) a long sheet made of a magnetic material having a resin layer on both sides with a certain width. The magnetic tape 90 with a resin layer has a groove 74 having a depth d that accommodates one burr 75b of a pair of burrs 75a and 75b formed on both ends 73a and 73b in the width direction when a long sheet is cut. The back surface 90a is provided along the longitudinal direction. The groove 74 is positioned closer to one end surface 73a than the center in the width direction of the magnetic tape 90 with a resin layer, that is, when the magnetic tape 90 with a resin layer is spirally wound around the resin tape layer 6, The burr 75 b is formed at a position where it enters the groove 74. When the magnetic tape 90 with the resin layer is wound around the resin tape layer 6, one back surface 72a of the back surface 72 separated by the groove 74 contacts the surface 71 of the magnetic tape 70 through the resin layer 91a. The other back surface 72b is in contact with the resin tape layer 6 through the resin layer 91b. The resin layer 91 has a thickness of 5 to 10 μm, for example. Since the magnetic tape 90 with a resin layer wound spirally is opposed to each other through a thin resin layer 91a, electromagnetic noise is difficult to leak, and a decrease in effective magnetic permeability can be suppressed.

(Magnetic tape manufacturing process)
First, as shown in FIG. 5A, a wide magnetic sheet 700 formed into an amorphous alloy is passed through the groove processing apparatus 10 to form grooves 74 by rolling.

  Next, the resin layer 91 is formed on both surfaces of the magnetic sheet 700 in which the groove 74 is formed. The resin layer 91 may be formed avoiding the groove 74, or the position corresponding to the groove 74 may be removed by etching or the like after the resin layer 91 is formed on the entire surface.

  Next, as shown in FIG. 5B, the magnetic tape 700 having a narrower width than the magnetic sheet 700 is formed by passing the amorphous magnetic sheet 700 through the slit processing apparatus 20.

  The magnetic tape 70 slitted by the slit processing apparatus 20 peels off the resin layer on the side where the grooves 74 are not formed, and then, as shown in FIG. 5C, burrs 75a and 75b are formed on both end faces 73a and 73b. The Thereafter, each magnetic tape 70 is wound on a roll or a reel.

(Operation and effect of the second embodiment)
According to the second embodiment, the following operations and effects are achieved.
(1) When the magnetic tape 90 with a resin layer is spirally wound around the resin tape layer 6, the other burr 75b enters the groove 74, and the magnetic tapes 90 with the resin layer come into surface contact with each other. The attached magnetic tape 90 is less likely to be lifted, thereby suppressing a decrease in effective magnetic permeability.
(2) The magnetic tape layer 9 with a resin layer absorbs the magnetic field of electromagnetic noise generated from the insulated wire 4 and suppresses radiation of electromagnetic noise.
(3) Since the magnetic tape layer 9 with a resin layer is formed by spirally winding the magnetic tape 90 with a resin layer, a shielded cable having excellent bending characteristics can be provided.
(4) Since the resin layers are formed on both surfaces of the magnetic sheet at the time of slit processing, generation of burrs can be suppressed.

  The embodiments of the present invention are not limited to the above-described embodiments, and various embodiments are possible. For example, in the first and second embodiments, the case where the burrs 75a and 75b generated on both end surfaces in the width direction of the magnetic tape 70 are formed on the surface 71 side of the magnetic tape 70 has been described. Slit processing may be performed so that the other burr 75b is formed on the front surface 71 side. In this case, the groove 74 may be formed at the position of the surface 71 corresponding to the burr 75a.

  As the magnetic material of the magnetic tape 70, when the Curie temperature is Tc and the crystallization temperature is Tx, an amorphous alloy ribbon that satisfies Tx> Tc is heat-treated in a temperature range of Tc to Tc + 50 ° C. A composite magnetic strip for processing characterized by forming a resin layer on the strip may be used (see Japanese Patent No. 3512109).

As the magnetic material of the magnetic tape 70, the alloy composition is represented by _{Fe 100-a-b-c} -d M a Si b B c C d ( atomic%), wherein M is Ti, V, Zr, Nb, Mo, It is at least one element selected from Hf, Ta, and W, and 0 <a ≦ 10, 8 ≦ b ≦ 17, 5 ≦ c ≦ 10, 0.02 ≦ d ≦ 0.8, 13 <a + b + c + d ≦ 35 And an amorphous alloy ribbon composed of unavoidable impurities, in which Fe is substituted by 0.5 atomic% or more and 2 atomic% or less of Cu with an element concentration in the depth direction from the surface of the amorphous alloy ribbon. Amorphous alloy ribbon characterized by having a C concentration peak in a range of 2 to 20 nm deep from the surface of the amorphous alloy ribbon in terms of SiO ₂ when measured by GD-OES May be used (see Japanese Patent No. 5182601).

Further, as another magnetic material of the magnetic tape 70 is represented by alloy composition _{Fe 100-a-b-c} -d M a Si b B c Cu d ( atomic%), 0 ≦ a ≦ 10,0 ≦ b ≦ 20, 4 ≦ c ≦ 20, 0.1 ≦ d ≦ 3, 9 ≦ a + b + c ≦ 35 and an amorphous alloy ribbon composed of inevitable impurities, where M is Ti, V, Zr, Nb, Mo, At least one element selected from Hf, Ta, and W, and there is a Cu segregation portion where Cu is segregated at a higher concentration than the outermost surface portion on the surface side of the amorphous alloy ribbon, An amorphous alloy ribbon characterized in that the maximum value of the Cu concentration at the Cu segregation portion is 4 atomic% or less may be used (see Japanese Patent No. 5339192).

  In each of the above embodiments, the magnetic tape layer is formed by winding the magnetic tape in a spiral shape. However, the magnetic tape layer is not limited to the spiral shape. For example, the magnetic tape layer may be formed by braiding the magnetic tape.

  Further, a shield layer made of a shield wire made of a conductive material may be provided inside or outside the magnetic tape layer 7. Thereby, the magnetic tape layer 7 absorbs the magnetic field of the electromagnetic wave noise generated from the insulated wire 4 and shields the electromagnetic wave noise mainly in the low frequency band. The shield layer made of a conductive material absorbs the electromagnetic noise generated from the insulated wire 4 and shields the electromagnetic noise mainly in the high frequency band. For this reason, a highly reliable shielded cable suitable for noise shielding of a wide frequency band can be provided.

  Further, it is possible to omit or change some of the constituent elements of the above-described embodiment within a range not changing the gist of the present invention. For example, the inclusion 5 may be omitted if there is no problem in winding the resin tape around the plurality of insulated wires 4.

  The present invention is suitable for a power cable such as a three-core power cable connecting a motor and an inverter, or a signal transmission cable such as a differential cable for transmitting a differential signal.

DESCRIPTION OF SYMBOLS 1 ... Shield cable, 2 ... Conductor wire, 2a ... Metal fine wire, 3 ... Insulator, 4 ... Insulated electric wire, 5 ... Inclusion, 6 ... Resin tape layer, 7 ... Magnetic tape layer, 8 ... Sheath, 9 ... Resin layer Magnetic tape layer, 10 ... groove processing device, 11 ... pressing roller, 12 ... processing roller, 13 ... shaft, 20 ... slit processing device, 21a, 21b ... upper cutter, 22a, 22b ... lower cutter, 23,24 ... shaft 70 ... magnetic tape, 71 ... front surface, 72, 72a, 72b ... rear surface, 73a, 73b ... end surface, 74 ... groove, 75a, 75b ... burr, 90 ... magnetic tape with resin layer, 90a ... rear surface, 91, 91a, 91b ... resin layer, 700 ... magnetic sheet, 700a ... front surface, 700b ... back surface

Claims (8)

A magnetic tape formed by continuously cutting a long sheet of magnetic material with a certain width,
The magnetic tape which has a groove | channel which accommodates at least one burr | flash of a pair of burr | flash formed in the width direction both ends at the time of the cutting | disconnection of the said elongate sheet | seat along a longitudinal direction at least on the back surface. A magnetic tape formed by continuously cutting a long sheet made of a magnetic material having a resin layer formed on the back surface at a constant width,
The magnetic tape which has a groove | channel which accommodates at least one burr | flash of a pair of burr | flash formed in the width direction both end surfaces at the time of the cutting | disconnection of the said elongate sheet | seat along a longitudinal direction at least on a back surface.   The magnetic tape according to claim 1, wherein the magnetic material is an amorphous alloy.   The magnetic material contains Fe, Si, B, and Cu, and is further nanocrystalline into an amorphous alloy containing at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W. The magnetic tape according to claim 1, which is a nanocrystalline soft magnetic alloy that has been subjected to a heat treatment for crystallization. An insulated wire having a conductor wire covered with an insulator, and
A magnetic tape layer formed by winding a magnetic tape around the insulated wire;
The magnetic tape is a magnetic tape formed by continuously cutting a long sheet made of a magnetic material at a constant width, and is formed on both end surfaces in the width direction when the long sheet is cut. The shielded cable which has a groove | channel which accommodates at least one burr | flash of a pair of burr | flash formed at least in the surface which faces the said insulated wire side along a longitudinal direction. An insulated wire having a conductor wire covered with an insulator, and
A magnetic tape layer formed by winding a magnetic tape around the insulated wire;
The magnetic tape is a magnetic tape formed by continuously cutting a long sheet made of a magnetic material having a resin layer formed on the surface on the insulated wire side with a certain width, and the long tape A shielded cable having a groove that accommodates at least one burr of a pair of burrs formed on both end surfaces in the width direction when cutting the sheet in the longitudinal direction on at least a surface facing the insulated wire side.   The shielded cable according to claim 5 or 6, wherein the magnetic material constituting the magnetic tape is an amorphous alloy.   The magnetic material constituting the magnetic tape contains Fe, Si, B, and Cu, and further contains at least one element selected from Ti, V, Zr, Nb, Mo, Hf, Ta, and W. The shielded cable according to claim 5 or 6, which is a nanocrystalline soft magnetic alloy obtained by subjecting an amorphous alloy to a heat treatment for nanocrystallization.

Images